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general::
Phrase(s): We(‘ll) have to do lunch sometime. [and] Let’s do lunch (sometime).
We must have lunch together sometime. (A vague statement that may lead to lunch plans.) • Rachel: Nice to talk to you, Tom. We have to do lunch sometime. Tom: Yes, good to see you. I’ll give you a ring. • Tom: Can’t talk to you now. Catch you later. Mary: We’ll have to do lunch sometime. • John: Good to see you, Tom. Tom: Right. Let’s do lunch sometime. John: Good idea. I’ll call you. • Mary: Catch you later. Sue: Sure. Let’s do lunch. Mary: Okay. Call me. Bye.
McGrawhill's American Idioms And Phrasal Verbs